Perhaps you should try some spelling variations:
hoc chinh » hoan chinh, hoc sinh, hoc kinh
hang manh » hoang manh, hung manh, dang manh
dung cong » dung trong
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - hang manh cua dung cong ((dan than) or (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - hang manh cua dung cong ((dan than) OR (van than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - hang manh cua dung cong ((dan than) or (van than)) cao*.